Abstract
The objective of the present study was to estimate the population parameters, including length-weight relationship (LWR), condition factor (KF), relative condition factor (K n ), age, growth, and mortality of Capoeta damascina in the Azad Dam and Komasi River in the Kurdistan Province, Iran. Total length and weight were 51-350 (180.6±68.63) mm and W: 2.5-465 (93.3±110.89) g in the river and 120-260 (191.5±30.76) mm and 14.7-216 (75.9±39.89) g in the dam Lake and river, respectively. The length-weight regression was W=0.0122×FL 2.9338 . The sex ratio (M:F) was 1:0.47, for adult C. damascina which differed significantly from the expected 1:1 ( P <0.001). The von Bertalanffy growth parameters were estimated as L ∞ = 373.3 mm, K = 0.17 yr -1 and t 0 = -0.58 yr. The instantaneous coefficient of natural mortality was estimated as 0.36 yr -1 . The average KF values were 1.13±0.14 and 0.98±0.18, and K n were 1.11±0.12 and 0.98±0.18, in the river and the lake, respectively. In conclusion, C. damascina showed an isometric growth pattern, which the rapid growth is occurred during the two first years of life. The K n showed that the fish were at suitable welfare conditions in the Azad Dam.
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